MauticTwigTemplatesBundle not shown

I did it. And since than the site is not available any more:
The site is currently offline due to encountering an error. If the problem persists, please contact the system administrator.

Then I tried a
php bin/console mautic:update:find
which tells me that there are no updates, which is correct.

Then I did a
composer update mautic/core-lib --with-dependencies
which ran through and ended with the following error:

sh: 1: npm: not found
Script npm ci --prefer-offline --no-audit handling the npm-ci event returned with error code 127
Script @npm-ci was called via post-update-cmd

Well do I really need npm? I don’t want to install a bunch of packages that are not really needed.

It get’s annoying. Such a mess because of a plugin for which I have to pay also money!

Kind regards

Christian